Inverted Mortar are pedestals, odo Sango found mostly in by the Igbomina and Ekiti tribes of Norther Eastern Yorubaland. Associated with the worship of the god of thunder, Sango, these inverted mortars are placed in Sango shrines and used as pedestal bases to hold calabash vessels within which thunder-stone(edun ara) are stored.
A festival is held annually for the worship of Sango. Before the festivals takes place, the odo Sango and other shrine objects are prepared by being washed and re-painted in Sango colours (red , white and blue) On the day day of festival, an animal sacrifice is made and it's blood is poured over the collected edun ara placed in vessels stored on the odo Sango. The babalawo then offers prayers to Sango through esu (the messenger of Yoruba gods) to knowledge the sacrifice made.